Still from American Sniper. The comic is never named, but if you look closely, you can see that it's issue No. 1 of the sixth volume of Punisher, released in January of 2004 (making it very believable as something Biggles could be reading during the platoon's 2004 deployment).
A Dr. Garry Choy, MD, Diagnostic Radiology, answered. Radiation fibrosis is the result of prior radiation exposure that results in scarring of an organ such as breasts, lungs, etc. Post radiation treatment fibrosis is the typical cause.
Pulmonary infiltration can lead to lung fibrosis (i.e., the hardening and thickening of tissue) that can cause permanent scarring. Fibrosis tends to develop in areas where the infiltration lasts a long time or where it is especially dense. Fibrosis causes the lungs to stiffen, making it difficult to breathe. Unfortunately, fibrosis is irreversible. If extensive, it can cause severe dysfunction and, at its worse, can lead to heart failure. Although often asymptomatic, granulomas in the lung can cause assorted respiratory problems, including: 1  A persistent, dry cough. 2  Chest pain. 3  Hemoptysis (spitting up of blood from the lungs).